What's the Difference Between a Printer and a Plotter?
A plotter is built to print vector-based technical drawings, like CAD files, GIS maps, and blueprints, with exact line accuracy at any resolution. A printer is the broader term for any device that outputs raster content: documents, photos, posters, and general graphics. In practice, most plotters sold today are inkjet printers. They just include a plotter-emulation language that lets them behave like one.
Why "Plotter" Used to Mean a Different Machine
The word "plotter" comes from actual mechanical devices. Early plotters held a pen or ink stylus and moved it across the page along X and Y coordinates sent from a computer. That's where the term "vector drawing" comes from: the machine traced a path directly, point to point.
HP introduced its own version of this control language, HP-GL, in 1977 with the HP 9872 plotter. It became the standard language across most plotters for the next decade.
Pen plotters were standard in engineering and drafting offices through the 1970s and 80s. They were precise, but slow, and limited to line work. As inkjet technology advanced, companies phased out pen plotters.
For the fuller history, including HP's own pen plotters and the electrostatic printers that came before today's DesignJet line, see What Is a Plotter?.
What Actually Makes a Plotter a Plotter Today
Today's plotters don't use a pen. HP's DesignJet line, like most other wide-format machines sold as plotters, uses inkjet technology. What makes them plotters is a printer language called HP-GL/2, an updated version of that original 1977 language, built into the machine. HP-GL/2 keeps dimensional accuracy consistent no matter the print resolution. A drawing printed at 300 dpi comes out the same size and line weight as one printed at 1200 dpi.
SBR sells HP's current DesignJet plotters, including the T1600 and T2600, both built around this same accuracy standard.
That's the real modern distinction. A plotter is built for vector-heavy technical work, where a line has to hold its exact position and scale. A printer covers everything else: photos, posters, marketing materials, and general documents, where raster image quality matters more than line-for-line accuracy.
So a "plotter" today is really a printer with a specific job. The name outlasted the mechanism.
Printer vs. Plotter at a Glance
The differences are easier to see side by side. Here's how the categories actually break down for most buyers today.
| Printer | Plotter | |
|---|---|---|
| Best for | Documents, photos, posters | CAD drawings, GIS maps, blueprints |
| Output type | Raster (dots/pixels) | Vector-accurate line work |
| Typical language | Standard print drivers | HP-GL/2, PostScript |
| Common use case | General office/home printing | Engineering, architecture, drafting |
Which One Do You Need?
If the job is technical drawings, engineering plans, or GIS maps that need to hold their scale, that's a plotter. Line accuracy and CAD file compatibility matter more than raw speed or photo-quality color.
If the job is documents, marketing materials, or photo prints, a standard printer covers it. Raster image quality and general versatility matter more than vector precision.
Our CAD & Engineering Printers page covers the HP DesignJet T1600 and T2600, the two models built specifically for that kind of work.
Printer vs. Plotter FAQs
Is a plotter the same as a printer?
Not exactly, though the line has blurred. Today's plotters are inkjet printers with an added plotter-emulation language for dimensional accuracy. Today, the difference is mostly about what the machine is built for: technical accuracy versus general output.
Do plotters still use pens?
Rarely. Pen plotters were standard through the 1970s and 80s, but modern plotters, including HP's DesignJet line, use inkjet technology instead.
What is a plotter used for?
Plotters are used for technical drawings that need to stay accurate at scale: CAD drawings, engineering plans, GIS maps, and blueprints.
What is HP-GL/2?
HP-GL/2 is a printer language that keeps dimensional accuracy consistent regardless of the printer's resolution. It's what lets a modern inkjet plotter reproduce a CAD drawing at the exact size and scale it was drawn.
Can a plotter print regular documents?
Yes. Most modern plotters, including HP DesignJets, print standard documents and raster images just fine. The plotter-specific advantage only matters for vector-heavy technical work.
Is a wide-format printer the same as a plotter?
Usually, yes, for practical purposes. Most large-format printers marketed today, including plotters, fall under the wide-format printer category. Whether a specific model is called a printer or a plotter usually comes down to marketing convention rather than a hard technical line.
